['Air Programs']
['Hazardous Air Pollutants']
05/16/2024
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As required in §63.2470, you must meet each emission limit in the following table that applies to your storage tanks:
| For each . . . | For which . . . | Then you must . . . |
|---|---|---|
| 1€‰Beginning no later than the compliance dates specified in §63.2445(g), any flare using fuel gas from a fuel gas system, of which 50 percent or more of the fuel gas is derived from an MCPU that has processes and/or equipment in ethylene oxide service or that produces olefins or polyolefins, as determined on an annual average basis, must be in compliance with §63.2450(e)(5). For purposes of compliance, an MCPU that "produces olefins or polyolefins" includes only those MCPUs that manufacture ethylene, propylene, polyethylene, and/or polypropylene as a product. By-products and impurities as defined in §63.101, as well as wastes and trace contaminants, are not considered products. | ||
| 1. Group 1 storage tank | a. The maximum true vapor pressure of total HAP at the storage temperature is ‰¥76.6 kilopascals | i. Reduce total HAP emissions by ‰¥95 percent by weight or to ‰¤20 ppmv of TOC or organic HAP and ‰¤20 ppmv of hydrogen halide and halogen HAP by venting emissions through a closed vent system to any combination of control devices (excluding a flare); or |
| ii. Reduce total organic HAP emissions by venting emissions through a closed vent system to a flare; or | ||
| iii. Comply with the requirements in §63.2450(e)(4), as applicable; and reduce total HAP emissions by venting emissions to a fuel gas system or process in accordance with §63.982(d) and the requirements referenced therein.1 | ||
| b. The maximum true vapor pressure of total HAP at the storage temperature is <76.6 kilopascals | i. Comply with the requirements of subpart WW of this part, except as specified in §63.2470; or | |
| ii. Reduce total HAP emissions by ‰¥95 percent by weight or to ‰¤20 ppmv of TOC or organic HAP and ‰¤20 ppmv of hydrogen halide and halogen HAP by venting emissions through a closed vent system to any combination of control devices (excluding a flare); or | ||
| iii. Reduce total organic HAP emissions by venting emissions through a closed vent system to a flare; or | ||
| iv. Comply with the requirements in §63.2450(e)(4), as applicable; and reduce total HAP emissions by venting emissions to a fuel gas system or process in accordance with §63.982(d) and the requirements referenced therein.1 | ||
| 2. Halogenated vent stream from a Group 1 storage tank | You use a combustion control device to control organic HAP emissions | Meet one of the emission limit options specified in Item 2.a.i or ii. in Table 1 to this subpart. |
| 3. Storage tank of any capacity and vapor pressure | Beginning no later than the compliance dates specified in §63.2445(i), the stored liquid contains ethylene oxide such that the storage tank is considered to be in ethylene oxide service as defined in §63.2550 | Comply with the applicable emission limits specified in items 1 and 2 of this Table, and also: i. Reduce emissions of ethylene oxide by venting emissions through a closed-vent system to a flare; or ii. Reduce emissions of ethylene oxide by venting emissions through a closed-vent system to a control device that reduces ethylene oxide by ‰¥99.9 percent by weight, or to a concentration <1 ppmv for each storage tank vent. |
[68 FR 63888, Nov. 10, 2003, as amended at 71 FR 40340, July 14, 2006; 85 FR 49162. Aug. 12, 2020]
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